Be Sure You're Helping Guard Against The Current Strains of Flu

It's An Evolving Organism

Once a single, stable H1N1 subtype, the influenza A virus in swine (IAV-S) is genetically changing and transmitting at a rapidly increasing pace. Understanding how a single, stable IAV-S subtype evolved into multiple subtypes is critical to controlling the virus.

New Strains Means Herds With Pre-Existing Immunity Aren't Protected

The prevalent influenza virus strains menacing swine production have evolved as new subtypes and clusters of H1N1, H1N2 and H3N2, which means the virus can spread rapidly through herds, even with pre-existing immunity.1

Prevalence of IAV-S strains

The 3 most common clusters2:

H1N1 Gamma

H1N2 Delta-1

H3N2 Cluster IV-A

H3N2 Clusters IV-A and IV-B have risen in importance of viruses circulating in U.S. swine today.2

Disease Is Present, Even When There Are No Clinical Signs4

Regardless of the farm type, age of pigs or time of year, disease can be present in pigs, even when there are no clinical signs.4 Ongoing surveillance is critical. Zoetis works closely with universities and veterinary diagnostic laboratories to evaluate which strains are impacting the industry now and those that may become problematic in the future.

Surveillance shows that 91% of farms enrolled in a 2009-2011 study tested positive for influenza at least once.4,5

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